CN116733726A - Interlocking device for preventing overpressure at outlet of hydraulic diaphragm metering pump - Google Patents
Interlocking device for preventing overpressure at outlet of hydraulic diaphragm metering pump Download PDFInfo
- Publication number
- CN116733726A CN116733726A CN202310725020.4A CN202310725020A CN116733726A CN 116733726 A CN116733726 A CN 116733726A CN 202310725020 A CN202310725020 A CN 202310725020A CN 116733726 A CN116733726 A CN 116733726A
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- Prior art keywords
- metering pump
- pressure
- diaphragm metering
- outlet
- value
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- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 12
- 230000001960 triggered effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005984 hydrogenation reaction Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- WDCYWAQPCXBPJA-UHFFFAOYSA-N 1,3-dinitrobenzene Chemical group [O-][N+](=O)C1=CC=CC([N+]([O-])=O)=C1 WDCYWAQPCXBPJA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012354 overpressurization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- -1 pharmacy Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0081—Special features systems, control, safety measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/022—Stopping, starting, unloading or idling control by means of pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
Abstract
An interlocking device for preventing the excessive pressure of an outlet of a hydraulic diaphragm metering pump comprises the hydraulic diaphragm metering pump, an input pipe and an output pipe which are connected with the hydraulic diaphragm metering pump, wherein a liquid inlet valve and a liquid outlet valve are respectively arranged on the input pipe and the output pipe, a pressure gauge is arranged at the front end of the output pipe, which is positioned at the liquid outlet valve, an energy accumulator is communicated with the output pipe, and a pressure release valve is connected at the rear end of the energy accumulator; the outlet of the hydraulic diaphragm metering pump is provided with a pressure transmitter, a motor of the hydraulic diaphragm metering pump is connected with an ammeter for monitoring motor current and a solenoid valve for controlling the motor to run or close, the pressure transmitter, the ammeter and the solenoid valve are respectively connected with an upper computer in a signal mode, the monitoring values of the pressure transmitter and the ammeter are sent to the upper computer in real time, the upper computer compares the obtained pressure value and current value with preset values, and when the pressure value and the current value are larger than or equal to the preset values, the upper computer sends a signal to the solenoid valve to be disconnected, and the motor is closed to run. The invention has simple and reliable operation, low cost and high safety.
Description
Technical Field
The invention relates to the technical field of metering pumps, in particular to an interlocking device and an interlocking method for preventing an outlet of a hydraulic diaphragm metering pump from being overpressurized.
Background
The hydraulic diaphragm metering pump is also called a plunger diaphragm metering pump, and is a metering pump designed by combining the characteristics of a plunger metering pump and a diaphragm metering pump. The part of the metering pump, which is in contact with the medium to be metered, is a diaphragm, and the driving part is a hydraulic plunger. The driving gear drives the hollow plunger to reciprocate and drives the metering diaphragm through hydraulic oil in the hollow plunger. The hollow plunger is provided with a specially designed adjusting cavity, so that the hydraulic oil inside and outside the plunger is the same. An adjustable slip ring for closing the adjusting space is sleeved outside the plunger. When the regulating hole is closed, the plunger pushes the hydraulic oil inside to drive the metering diaphragm. In each stroke, the amount of hydraulic oil pushed by the plunger to drive the metering diaphragm is exactly equal to the amount of medium being metered. The flow of the metering pump can be regulated by a manual knob on a plunger flange, and also can be regulated by a frequency converter, a servo motor and the like.
The hydraulic diaphragm metering pump can be widely used in industries and scientific departments such as petroleum, chemical industry, textile, food, paper making, atomic energy technology, power plants, plastics, pharmacy, water factories, environmental protection and the like. The purpose of accurately measuring the liquid can be realized; the liquid conveying device has the characteristic of no leakage of conveying liquid; can be applied to the transportation of flammable, explosive, volatile, highly corrosive, radioactive, highly toxic and suspension liquid and expensive liquid medium; has the characteristic of high-pressure liquid conveying. However, the main disadvantage is that the pump is easy to be over-pressurized, serious accidents are easily caused, at present, a safety valve is additionally arranged at the outlet of the pump (see figure 1) at home and abroad, and when the pump is over-pressurized and the relief pressure of the safety valve is reached, the safety valve starts to release pressure and discharge until the pressure is normal, and then the safety valve returns to a seat to be closed, so that the over-pressurization of the pump is avoided.
The method can achieve the purpose of avoiding the overpressure of the pump outlet under partial conditions, but has great potential safety hazards and defects, such as: when the pipeline is blocked by the easy crystallization of the conveying medium, the safety valve cannot ensure normal pressure relief; the safety valve belongs to a safety accessory, and has the defects of failure, inaccurate verification of release pressure or possibility of jamming, and under the condition, the safety valve cannot guarantee normal release; when the overpressure is released, the safety valve is opened instantly, the pressure is usually in a normal pressure or micro-positive pressure state after the safety valve, if the pump outlet pressure is high pressure or ultrahigh pressure, once the overpressure is released, a high pressure or ultrahigh pressure medium instantly enters normal pressure or micro-positive pressure equipment, and serious accidents are easily caused. In summary, the existing method for installing the safety valve at the outlet of the hydraulic diaphragm metering pump cannot thoroughly and effectively solve the problem of pump outlet overpressure.
Disclosure of Invention
Aiming at the technical problems, the technical scheme provides an interlocking device and an interlocking method for avoiding the overpressure of the outlet of the hydraulic diaphragm metering pump, when the pump is in overpressure, a motor of the hydraulic diaphragm metering pump is closed, the operation of the motor is stopped, the hydraulic plunger is stopped, the flow of the metering pump is regulated, and therefore the pressure of the outlet of the hydraulic diaphragm metering pump is reduced; the problems can be effectively solved.
The invention is realized by the following technical scheme:
an interlocking device for preventing the excessive pressure of an outlet of a hydraulic diaphragm metering pump comprises the hydraulic diaphragm metering pump, an input pipe and an output pipe which are respectively connected with the inlet and the outlet of the hydraulic diaphragm metering pump, wherein a liquid inlet valve and a liquid outlet valve are respectively arranged on the input pipe and the output pipe; the outlet of the hydraulic diaphragm metering pump is provided with a pressure transmitter, a motor of the hydraulic diaphragm metering pump is connected with an ammeter for monitoring motor current and a solenoid valve for controlling the motor to run or close, the pressure transmitter, the ammeter and the solenoid valve are respectively connected with an upper computer in a signal mode, the pressure transmitter and the ammeter send monitoring values of the pressure transmitter and the ammeter to the upper computer in real time, the upper computer compares obtained pressure values and current values with preset values, and when the pressure values and the current values are larger than or equal to the preset values, the upper computer sends signals to the solenoid valve to be disconnected, and the motor is closed to run.
Further, the pressure transmitter, the ammeter and the electromagnetic valve are respectively connected with the upper computer through cables in a signal mode.
Further, the pressure transmitter, the ammeter and the electromagnetic valve are respectively provided with a wireless module and are connected with an upper computer through a local area network in a signal manner.
An interlocking method for avoiding the overpressure of the outlet of a hydraulic diaphragm metering pump is used by matching with the interlocking device for avoiding the overpressure of the outlet of the hydraulic diaphragm metering pump, a high alarm value and a high interlocking value are set for a pressure transmitter, a high alarm value and a high interlocking value are set for an ammeter, interlocking logic for promoting the hydraulic diaphragm metering pump to stop working is established for the pressure transmitter and the ammeter, an electromagnetic valve and an upper computer are debugged, and the hydraulic diaphragm metering pump is normally put into operation.
Furthermore, the interlocking logic is two-in-one logic, namely after the monitoring value of any one of the pressure transmitter and the ammeter is larger than the set upper limit value, the interlocking is triggered, the electromagnetic valve is triggered to be disconnected, and the motor of the hydraulic diaphragm metering pump stops running.
Advantageous effects
Compared with the prior art, the interlocking device and the interlocking method for preventing the overpressure of the outlet of the hydraulic diaphragm metering pump have the following beneficial effects:
when the pump is in overpressure, the motor of the hydraulic diaphragm metering pump is closed, the operation of the motor is stopped, the hydraulic plunger is stopped from working, and the flow of the metering pump is regulated, so that the pressure of the outlet of the hydraulic diaphragm metering pump is reduced; the operation is simple and reliable, the cost is low, the safety is high, and the dangerous problem mentioned in the background art can not appear.
Drawings
Fig. 1 is a schematic diagram of a prior art scheme in the background art.
Fig. 2 is a schematic diagram of the overall piping connection of example 1 in the present invention.
Fig. 3 is a schematic diagram of the overall piping connection before modification of case 1.
Fig. 4 is a schematic diagram of the overall piping connection of case 1.
Fig. 5 is a schematic circuit diagram of the pressure transducer and ammeter and host computer in case 1.
Fig. 6 is an interface diagram of the upper computer interlock setting in case 1.
Reference numerals in the drawings: 1-hydraulic diaphragm metering pump, 11-inlet, 12-outlet, 13-motor, 21-input pipe, 22-output pipe, 3-feed liquor valve, 4-play liquid valve, 5-manometer, 6-energy storage ware, 7-relief valve, 8-pressure transmitter, 9-ampere meter, 10-relief valve, 14-cable wire, 15-host computer.
Description of the embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all, embodiments of the invention. Various modifications and improvements of the technical scheme of the invention, which are made by those skilled in the art, are included in the protection scope of the invention without departing from the design concept of the invention.
Examples
As shown in fig. 2, the interlocking device for preventing the overpressure at the outlet of the hydraulic diaphragm metering pump comprises a hydraulic diaphragm metering pump 1, an input pipe 21 and an output pipe 22 which are respectively connected with an inlet 11 and an outlet 12 of the hydraulic diaphragm metering pump 1, a liquid inlet valve 3 and a liquid outlet valve 4 are respectively arranged on the input pipe 21 and the output pipe 22, a pressure gauge 5 is arranged at the front end of the liquid outlet valve 4 on the output pipe 22, an energy accumulator 6 communicated with the output pipe 22, and a pressure relief valve 7 is connected at the rear end of the energy accumulator 6.
The outlet of the hydraulic diaphragm metering pump 1 is provided with a pressure transmitter 8, a motor 13 of the hydraulic diaphragm metering pump 1 is connected with an ammeter 9 for monitoring the current of the motor 13 and an electromagnetic valve for controlling the motor 13 to run or close, the pressure transmitter 8, the ammeter 9 and the electromagnetic valve are respectively connected with an upper computer 15 in a signal mode, the pressure transmitter 8 and the ammeter 9 send monitoring values of the pressure transmitter 8 and the ammeter 9 to the upper computer 15 in real time, the upper computer 15 compares obtained pressure values and current values with preset values, and when the pressure values and the current values are larger than or equal to the preset values, the upper computer 15 sends a signal to the electromagnetic valve to be disconnected, and the motor 13 is closed to run.
The pressure transmitter 8, the ammeter 9 and the electromagnetic valve are respectively connected with the upper computer 15 through a cable 14 in a signal mode or are connected with the upper computer 15 through the cooperation of a wireless module and a local area network in a signal mode.
Examples
An interlocking method for avoiding the overpressure of the outlet of a hydraulic diaphragm metering pump is used by matching with the interlocking device for avoiding the overpressure of the outlet of the hydraulic diaphragm metering pump, a high alarm value and a high interlocking value are set for a pressure transmitter, a high alarm value and a high interlocking value are set for an ammeter, interlocking logic for promoting the hydraulic diaphragm metering pump to stop working is established for the pressure transmitter and the ammeter, an electromagnetic valve and an upper computer are debugged, and the hydraulic diaphragm metering pump is normally put into operation.
The interlocking logic is two-in-one logic, namely after the monitoring value of any one of the pressure transmitter and the ammeter is larger than the set upper limit value, the interlocking is triggered, the trigger electromagnetic valve is disconnected, and the hydraulic diaphragm metering pump is stopped.
To verify the effect of the above embodiment, the inventors verified it with cases. The specific case is as follows:
case 1:
the dinitrate metering pump is additionally provided with interlocking equipment in a hydrogenation workshop, so that the dinitrate metering pump is protected, and before transformation, as shown in figure 3, mixed dinitrate enters a dinitrate metering pump P106A/B/C/D from a dinitrate metering tank V106A/B, is pressurized and metered by a reciprocating diaphragm metering pump, directly enters a hydrogenation primary reaction kettle R101A/B, and participates in hydrogenation reaction.
Before transformation, because the dinitrate metering pump is a reciprocating pump, when the metering pump is started, or if the outlet pipeline of the metering pump is not smooth or the outlet pipeline is provided with material crystallization and other phenomena in the operation process of the metering pump, the outlet overpressure of the metering pump is caused, for example, personnel on the post find that the metering pump is not timely, the equipment pipeline is extremely easy to damage, and serious safety accidents occur.
After modification, as shown in fig. 4. The mixed dinitrate is pressurized and metered by a metering pump P106A/B/C/D, enters a hydrogenation first-stage reaction kettle R101A/B and participates in hydrogenation reaction.
An interface is planned to be led out at a pressure gauge on site at a metering pump outlet, a pressure transmitter is additionally arranged, a motor of the metering pump is connected with an ammeter for monitoring motor current and a solenoid valve for controlling the motor to run or close, the pressure transmitter, the ammeter and the solenoid valve are respectively connected with an upper computer through cables in a signal mode, a circuit schematic diagram of the pressure transmitter, the ammeter and the upper computer is shown in fig. 5, the pressure transmitter and the ammeter send monitoring values of the pressure transmitter and the ammeter to the upper computer in real time, the upper computer compares obtained pressure values and current values with preset values, and when the pressure values and the current values are larger than or equal to the preset values, the upper computer sends signals to the solenoid valve to be disconnected, and the motor is closed to run.
The pressure transmitter and the ammeter are used as interlocking conditions for judging whether the pump is stopped due to high pressure in the system, and the pressure interlocking and the current interlocking are set to be two-out-of-one to trigger the pump stopping for avoiding triggering the interlocking to stop the pump due to instrument faults. An interface diagram of the upper computer interlocking arrangement is shown in fig. 6.
The model of the metering pump is a PJ25M-2000/2.5BP-RL1-RJ4-YB hydraulic diaphragm metering pump, the conveying medium is dinitrobenzene, the high alarm value of the pump outlet pressure is set to be 1.8MPa, the high pressure interlocking value is 2.0MPa, the high alarm value of the pump motor current is 11A, and the high current interlocking value is 13A.
The outlet pressure of the metering pump and the current of the motor of the metering pump are interlocked for 3 times, and when the pump outlet pressure is more than 2.0MPa and the current of the motor of the pump is more than 13A, the interlocked stop hydraulic diaphragm pump is successfully triggered.
In the starting or running process of the modified dinitrate metering pump, if the phenomena such as unsmooth pipeline or material crystallization and the like exist, the excessive pressure of the outlet of the metering pump is caused, the excessive current of the motor of the metering pump is caused, the pressure interlocking of the outlet of the metering pump and the motor current interlocking of the metering pump are triggered simultaneously, the metering pump automatically stops running in an emergency after the interlocking is triggered, equipment and pipelines can be prevented from being damaged, and safety accidents are avoided.
Case 2
The hydraulic diaphragm metering pump with the metering pump model PJ25M-1000/1.0BP-RL1-RJ4-YB is provided, the conveying medium is methanol, the high alarm value of the outlet pressure of the metering pump is set to 0.6MPa, the high pressure interlocking value is set to 0.8MPa, the high alarm value of the motor current of the metering pump is set to 3A, the high current interlocking value is set to 5A, the pressure at the outlet of the metering pump and the motor current interlocking of the metering pump are tested for 3 times, and when the outlet pressure of the metering pump is greater than 0.8MPa and the motor current of the metering pump is greater than 5A, the interlocking hydraulic diaphragm pump is successfully triggered.
The foregoing is merely exemplary embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes, substitutions and modifications within the technical scope of the present invention are all within the scope of the present invention.
Claims (5)
1. An interlocking device for preventing the excessive pressure of an outlet of a hydraulic diaphragm metering pump comprises the hydraulic diaphragm metering pump (1), an input pipe (21) and an output pipe (22) which are respectively connected with an inlet (11) and an outlet (12) of the hydraulic diaphragm metering pump (1), a liquid inlet valve (3) and a liquid outlet valve (4) are respectively arranged on the input pipe (21) and the output pipe (22), a pressure gauge (5) is arranged at the front end of the liquid outlet valve (4) and an energy accumulator (6) communicated with the output pipe (22), and a pressure release valve (7) is connected at the rear end of the energy accumulator (6); the method is characterized in that: the pressure transmitter (8) is installed in the export (12) of hydraulic pressure diaphragm metering pump (1), motor (13) of hydraulic pressure diaphragm metering pump (1) are connected with ampere meter (9) that are used for monitoring motor (13) electric current and are used for controlling motor (13) operation or closed solenoid valve, pressure transmitter (8), ampere meter (9) and solenoid valve respectively with host computer (15) signal connection, pressure transmitter (8) and ampere meter (9) send its monitoring value to host computer (15) in real time, host computer (15) compares the pressure value and the current value that will obtain with the interlock value of predetermineeing, when pressure value and current value are greater than or equal to the interlock value of predetermineeing, host computer (15) sends signal to solenoid valve disconnection, shut down motor (13) operation.
2. An interlock for avoiding excess pressure at the outlet of a hydraulic diaphragm metering pump as claimed in claim 1 wherein: the pressure transmitter (8), the ammeter (9) and the electromagnetic valve are respectively connected with the upper computer (15) through cables (14) in a signal mode.
3. An interlock for avoiding excess pressure at the outlet of a hydraulic diaphragm metering pump as claimed in claim 1 wherein: the pressure transmitter (8), the ammeter (9) and the electromagnetic valve are respectively provided with a wireless module and are connected with the upper computer (15) through a local area network in a signal mode.
4. An interlocking method for avoiding overpressure at the outlet of a hydraulic diaphragm metering pump, which is used with the interlocking device for avoiding overpressure at the outlet of the hydraulic diaphragm metering pump according to any one of claims 1 to 3, and is characterized in that: setting a high alarm value and a high interlocking value for the pressure transmitter (8), setting a high alarm value and a high interlocking value for the ammeter (9), establishing interlocking logic for the high alarm value and the high interlocking value for the ammeter to enable the hydraulic diaphragm metering pump (1) to stop working, and debugging the pressure transmitter (8), the ammeter (9), the electromagnetic valve and the upper computer (15) normally for use.
5. An interlocking method for avoiding excess pressure at the outlet of a hydraulic diaphragm metering pump according to claim 1, wherein: the interlocking logic is two-in-one logic, namely, after any one of the monitoring values of the pressure transmitter (8) and the ammeter (9) is larger than the set upper limit value, the interlocking is triggered, the electromagnetic valve is triggered to be disconnected, and the motor of the hydraulic diaphragm metering pump (1) stops running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725020.4A CN116733726A (en) | 2023-06-19 | 2023-06-19 | Interlocking device for preventing overpressure at outlet of hydraulic diaphragm metering pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725020.4A CN116733726A (en) | 2023-06-19 | 2023-06-19 | Interlocking device for preventing overpressure at outlet of hydraulic diaphragm metering pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116733726A true CN116733726A (en) | 2023-09-12 |
Family
ID=87916611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310725020.4A Pending CN116733726A (en) | 2023-06-19 | 2023-06-19 | Interlocking device for preventing overpressure at outlet of hydraulic diaphragm metering pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116733726A (en) |
-
2023
- 2023-06-19 CN CN202310725020.4A patent/CN116733726A/en active Pending
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